browser/libs/state/src/core/implementations/default-active-user-state.provider.ts

// FIXME: Update this file to be type safe and remove this and next line
// @ts-strict-ignore
import { Observable, distinctUntilChanged } from "rxjs";

import { UserId } from "@bitwarden/user-core";

import { ActiveUserAccessor } from "../active-user.accessor";
import { UserKeyDefinition } from "../user-key-definition";
import { ActiveUserState } from "../user-state";
import { ActiveUserStateProvider, SingleUserStateProvider } from "../user-state.provider";

import { DefaultActiveUserState } from "./default-active-user-state";

export class DefaultActiveUserStateProvider implements ActiveUserStateProvider {
  activeUserId$: Observable<UserId | undefined>;

  constructor(
    private readonly activeAccountAccessor: ActiveUserAccessor,
    private readonly singleUserStateProvider: SingleUserStateProvider,
  ) {
    this.activeUserId$ = this.activeAccountAccessor.activeUserId$.pipe(
      // To avoid going to storage when we don't need to, only get updates when there is a true change.
      distinctUntilChanged((a, b) => (a == null || b == null ? a == b : a === b)), // Treat null and undefined as equal
    );
  }

  get<T>(keyDefinition: UserKeyDefinition<T>): ActiveUserState<T> {
    // All other providers cache the creation of their corresponding `State` objects, this instance
    // doesn't need to do that since it calls `SingleUserStateProvider` it will go through their caching
    // layer, because of that, the creation of this instance is quite simple and not worth caching.
    return new DefaultActiveUserState(
      keyDefinition,
      this.activeUserId$,
      this.singleUserStateProvider,
    );
  }
}